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authorPrashanth Nageshappa <prashanth@linux.vnet.ibm.com>2012-02-28 09:43:01 +0530
committerArnaldo Carvalho de Melo <acme@redhat.com>2012-02-29 18:29:46 -0300
commit1c1bc9223387dacc48eb2b61b0baabe7e9cf47f6 (patch)
tree873357b11c3423f2b8798b0c9e8e5ac18735db66
parentcfbd70c17c4535e64be92ea442a2a45078a18184 (diff)
downloadlinux-stericsson-1c1bc9223387dacc48eb2b61b0baabe7e9cf47f6.tar.gz
perf probe: Ensure offset provided is not greater than function length without DWARF info too
The 'perf probe' command allows kprobe to be inserted at any offset from a function start, which results in adding kprobes to unintended location. (example: perf probe do_fork+10000 is allowed even though size of do_fork is ~904). My previous patch https://lkml.org/lkml/2012/2/24/42 addressed the case where DWARF info was available for the kernel. This patch fixes the case where perf probe is used on a kernel without debuginfo available. Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Jason Baron <jbaron@redhat.com> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/4F4C544D.1010909@linux.vnet.ibm.com Signed-off-by: Prashanth Nageshappa <prashanth@linux.vnet.ibm.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/perf/util/probe-event.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 29cb65459811..e33554a562b3 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1867,6 +1867,12 @@ static int convert_to_probe_trace_events(struct perf_probe_event *pev,
tev->point.symbol);
ret = -ENOENT;
goto error;
+ } else if (tev->point.offset > sym->end - sym->start) {
+ pr_warning("Offset specified is greater than size of %s\n",
+ tev->point.symbol);
+ ret = -ENOENT;
+ goto error;
+
}
return 1;